Heat shield added for CAI

[Genxer]

I added a heat shield a while back to help keep radiator wash out of my PMAS CAI. I mocked it up with cardboard first and then made it from two pieces, riveting together. Later I will post a pic of the part I added on top of the intake tube itself to control heat, but it's akin to the little foam piece that JLTs use. Overall, I think both pieces work together well to get the most out of the added flow of the PMAS. The PMAS guys mentioned that any time they tried to snorkel their intake it would cut down flow, so I decided the best way to get the best air temp along with flow this was to simply provide a large pathway for air to come in, while cutting down on hot air in the main stream of air being sucked in. My PMAS box has an enlarged opening on the front, that I cut. Without a snorkel, this can pull air from the grille, as well as the wheel well. Yes, a little hot air gets in from other places, but this is about eliminating some of the biggest contributors to heat while not limiting flow.

The air filter assembly is not on here, and neither is the radiator cover, which hides a great deal of the metal shield when installed.The shield is slipped in alongside the remains of the OE snorkel and goes back all the way to the plastic intake box. The tab is attached to the radiator support.

This is the sheet metal part with the mounting tab.

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[MasterCylinder]

So then what does it all look like completed? Why not pick up a Velossa tech?

 

[Genxer]

So then what does it all look like completed? Why not pick up a Velossa tech?

I felt like the Velossa tech part would not suit my needs because even if it were to extend far enough back to meet the intake box, it is limited on volume. If it did not extend far enough back, then the unit would allow more hot air than my solution. Mine cost a few bucks and some time, and I can install / remove by simply removing the radiator cover and a single screw. You really don't see much with the cover on, hence the pic. About all that is noticeable is the projection at the top. I can add a pic later to show.

 

[MasterCylinder]

Ok. Cause I do know the Velossa, while does cost a bit, does extend passed the radiator and the void in front of it to envelope the left side hand side of the grill. Making it a straight shot from outside into the intake.

 

[EFI]

I felt like the Velossa tech part would not suit my needs because even if it were to extend far enough back to meet the intake box, it is limited on volume.

Well if you end up creating a nice sealing box to prevent all the radiator wash and engine bay heat from getting into the airbox, then where is the filter going to get it's air from if not from the front of the grill?

The intake has to breathe from somewhere and there are 2 main thoughts on that. Either create a perfectly sealed box (like the stock one) that only breathes cold air from the snorkel, or you create a rather open box and have it get air from around the engine bay or as most intakes do a combination of the 2. If you completely seal both then you're pretty much suffocating your intake with the only available air being from leakage past the headlight and/or the seal to the hood/fender.

If you're going to do all that, might as well open up the cold air path from the front of the car. It has been proven that even that small path is more than enough to provide sufficient air to the engine and the main limiting factor is the tube itself past the filter and to the throttle body. Plus, the colder the air is the more oxygen molecules are per volume, so you need less "space" to get in the required airflow.

 

[v8hgt]

There is a reason superbikes have airboxes that are perfectly sealed, fed by ram air, and generally double the CC of the swept volume!

 

[Genxer]

Well if you end up creating a nice sealing box to prevent all the radiator wash and engine bay heat from getting into the airbox, then where is the filter going to get it's air from if not from the front of the grill?

The intake has to breathe from somewhere and there are 2 main thoughts on that. Either create a perfectly sealed box (like the stock one) that only breathes cold air from the snorkel, or you create a rather open box and have it get air from around the engine bay or as most intakes do a combination of the 2. If you completely seal both then you're pretty much suffocating your intake with the only available air being from leakage past the headlight and/or the seal to the hood/fender.

If you're going to do all that, might as well open up the cold air path from the front of the car. It has been proven that even that small path is more than enough to provide sufficient air to the engine and the main limiting factor is the tube itself past the filter and to the throttle body. Plus, the colder the air is the more oxygen molecules are per volume, so you need less "space" to get in the required airflow.

I did not block the grille inlet at all, and have actually opened up some of the holes in the grille. Don't forget there is a rather large area to the right of the grille inlet (if you are facing the engine bay). All I have done is to simply block air on the radiator side with no effect on volume of flow. I wasn't looking to seal it, and don't need to go that far. All that is needed is some mitigation of excessive heat.

The PMAS guys have been on M6G before talking about flow vs heat, etc. I'd love to have them weigh in on this and give their thoughts, ideas.

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